A denitrification treatment method for exhaust gas from an ethylene cracking furnace

A technology of ethylene cracking furnace and treatment method, which is applied in the field of environmental protection waste gas treatment, can solve the problems such as further improvement of denitrification activity, and achieve the effect of ensuring long-term stable operation, high denitrification efficiency and high activity

Active Publication Date: 2021-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The denitrification activity of the catalyst under the condition of sulfur and water needs to be further improved

Method used

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  • A denitrification treatment method for exhaust gas from an ethylene cracking furnace
  • A denitrification treatment method for exhaust gas from an ethylene cracking furnace
  • A denitrification treatment method for exhaust gas from an ethylene cracking furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0033] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1 orthoethyl silicate to SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0034] (2) Add 54g of carbon black powder obtained in step (1) (based on the weight of carbon black powder),...

Embodiment 2

[0044] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0045] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1, and ethyl orthosilicate is SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0046] (2) Add 54g of carbon black powder obtained in step (1) (by weight of carbon black powder), 600g...

Embodiment 3

[0056] The cross-sectional size of the honeycomb denitration catalyst monomer in the embodiment is 150×150 mm, the pore diameter is 6-12 mm, and the wall thickness is 0.8-2.2 mm. The catalyst preparation process is:

[0057] (1) Add carbon black powder and cerium nitrate to the ethanol solution containing tetraethyl orthosilicate (wherein the solid-liquid mass ratio is 1:8, cerium nitrate is CeO 2 The mass ratio of meter to carbon black powder is 3:1 orthoethyl silicate to SiO 2 The mass ratio of meter to carbon black powder is 2:1), under the condition of ultrasonic dispersion (the energy density of ultrasonic dispersion is 0.6kW / L, the temperature of ultrasonic dispersion is 40°C, and the time of ultrasonic dispersion is 1 hour), mix well, filter, Dry the solid phase at 50°C for 2 hours, and dry to obtain carbon black powder modified by silicon and cerium sources;

[0058] (2) Add 54g of carbon black powder obtained in step (1) (based on the weight of carbon black powder),...

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Abstract

The invention relates to a denitrification treatment method for flue gas discharged from an ethylene cracking furnace. The flue gas flows sequentially through a radiation section, a convective heat exchange section A, an ammonia injection grid, a convective heat exchange section B, an SCR denitrification reaction section and a convective heat exchange section. C, the preparation method of the catalyst filled in the SCR denitration reaction section is as follows: (1) Add carbon black powder and cerium nitrate to the ethanol solution containing silicon source, mix under ultrasonic dispersion conditions, separate solid-liquid, and carry out solid phase Dry to obtain silicon and cerium modified carbon black powder; (2) Add modified carbon black powder to ethanol solution containing titanium source, add dilute nitric acid solution to form sol-gel, and then treat at high temperature in an oxygen-free atmosphere , roasted in an oxygen-containing atmosphere to obtain a macroporous titania carrier containing silicon and cerium; (3) After mixing the titania carrier, molecular sieve and active component precursor, molding it to obtain a honeycomb denitration catalyst. The method of the invention has good denitrification activity, strong ability to resist water vapor, the catalyst is not easy to crack, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of environmental protection waste gas treatment, and in particular relates to a denitrification treatment method for flue gas discharged from an ethylene cracking furnace. Background technique [0002] Nitrogen oxides (NOx) have N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other forms, and can cause a variety of hazards, such as photochemical smog can be produced with volatile organic compounds (VOC) in the atmosphere, which can cause strong irritation to the eyes and throat, and cause headaches and respiratory diseases. cause death. my country's NOx emissions have exceeded 20 million tons for many years in a row, 21.94 million tons in 2010, 24.043 million tons in 2011, 23.378 million tons in 2012, 22.273 million tons in 2013, and 20.78 million tons in 2014. In recent years, it has shown a continuous downward trend, but its pollution situation is still serious. On September 12, 2014, three mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/90B01J29/16B01J29/48B01J35/04B01D53/86B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01D2258/0283B01J29/163B01J29/166B01J29/48B01J35/04
Inventor 王明星王宽岭李欣姜阳
Owner CHINA PETROLEUM & CHEM CORP
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